Not sure how ANY liquid could be in the tube unless its plugged since it should fall on out the bottom?

 

Ah forgot to include I put a small container under the ATV to check for leaks, there were a few drops of fuel in it. I think also the float height might be incorrect, I have a Mikuni BST 31 and wasn't able to find the float height for this so the next best thing I was able to find were the specs for a BST 34 which has a recommended height of 12-14mm. I think the BST 31 I have may be lower than 12mm but I'm not able to find any specs for it online. I'll just have to lean it out a bit more and check again for any leaks. It has a new needle seat O-ring and the bowl has no leaks either so it's gotta be the float height.

 

I work on a lot of machines and NEVER measure float height. I just turn the carb up horizontal and the float arm should be level with the mating surface of the float bowl. Always works and very easy.

 

You or someone else did mention that before, I had asked about that method before but I wanted to go by the book but it's not always so easy to do that. You or someone else mentioned before that even for a slanted bowl like on my Mikuni, just to make it level with the mating surface of the float bowl as if the slant wasn't there. Did I get that right? I'll try that instead of squinting to look at tiny measurements on a ruler.

 

Yep. If its just a couple drops its nothing to worry about . If you want you can polish the needle seat with a Qtip in a drill with metal polish on it.

 

Here's my 2 cents:

If the floats are brass or the floats are separate from the float arm, I set the 'level' with the carb upside down so the float arm is horizontal with the horizon.

If the floats are plastic or composite, I set the level with the carb about 45 degrees from inverted - I actually tip the carb slowly so the needle just contacts the seat and set the float arm horizontal to the float bowl gasket surface. On the carbs that have the float bowl seat at an angle, I set the float arm horizontal to the main jet standard.

There are some goofey side draft carbs that have the float bowl on the side and have to be measured or set with a special tool, but high and low is just the opposite of what you thing it is 12mm is high while 14mm is low because you are looking at it upside down.

The BST31 is set the same as the BST34 at 13mm plus or minus 1mm - so high is 12mm and low is 14mm

 

Latebird explains it much better than I do OP. There ya go ^^

 

Thanks to you both, great information and well explained. I set the float using the above explained techniques and it solved my problem, no leaks out of the overflow drain any more and it was very easy to do, the ATV runs well again. I got caught up in the tiny measurements and trying to do it by the book but these methods you both explained are much easier and no tools needed.

Cheers